push notifications to iOS 13 ! How exactly?

[rafinewman]

What version of PushSharp are you using? 2.2

Describe your issue:

we have existing server app that send successfully push notifications to Android and iPhones with iOS < 13
but now we try to send to new app on iOS 13 and we always get various of failures from PushSharp and Apple gateways.
Why?
is it possible to send push to iOS 13 using PushSharp 2.x? how?
is it possible to send push to iOS 13 using PushSharp 4.x? how?

Please provide any Exception Stack Traces

push_OnServiceException (System.Security.Authentication.AuthenticationException): A call to SSPI failed, see inner exception

and also

push_OnNotificationRequeue Cause:Maximum number of attempts (3) to connect to gateway.push.apple.com:2195 was reached!, Queued count:6

and also

push_OnNotificationFailed: iOS, token=7de8a4a257a654ba51a1ef0249a9e3c263abf4af7a45c5f10bd950e1dae4704d - The maximum number of Send attempts to send the notification was reached!